The Pentagon says there are 301 generals and admirals whose nominations have been placed in limbo because of an indefinite “hold” by Sen. Tommy Tuberville, a Republican from Alabama, who wants the military to change its policy of reimbursing servicemembers for travel to get reproductive care, including abortions.

By the end of the year, the Pentagon says that number could swell to 650 generals and admirals who need Senate confirmation before they can assume their jobs. Any single senator can put a hold on nominations under Senate rules.